动脉导管监测

重症病患 血液動力監測導管之護理,Liu, Hsiu-Chen 2005-11-21,基本概念,血液動力學監測分 非侵入性方式：身體檢查與評估技巧( 如測量頸靜脈壓、水腫程度、呼吸音變化等)、監測心電圖、非侵入性血壓測量(NBP)、脈衝式血氧監測 (SPO2 ) 、超音波等 侵入性方式：侵入性的導管，放置在重要的血管( 動脈或靜脈) 或心臟內，利用高科技儀器來直接監測該處的壓力或血液成分的變化，使醫護人員快速、準確、持續的評估病人。,監測的基本配備,導 管 依照所欲監測的部位( 例如中心靜脈、動脈、肺動脈) 選擇適當的導管(cathter) 插入，在臨床上常使用的導管包括中心靜脈導管、動脈導管、肺動脈導管等 壓力管 材質較一般的輸液管來的堅硬，可減少導管彈性、熱脹冷縮、導管彎曲的影響。 導管長度不宜過長或過短，導管過長會影響壓力傳導，過短會使病人活動受限，因此通常大約為34 呎( 不超過90120 公分) 導管中間有一個三路活塞( 不超過3 個) 可供需要時使用,壓力感受器與壓力轉換器 壓力感受器(dome) 一端與壓力管相連，一端與壓力轉換器(transducer)相扣。 當血管內的壓力波動經由壓力管傳至壓力感受器時，其內側的膜面(diaphragm) 會震動、突出，此時震動、突出的膜面則撞擊壓力轉換器上的金屬膜，壓力轉換器則將金屬膜上的壓力轉換成電訊息(electrical signal)，並將電訊息放大在監視器(monitor) 上呈現出壓力的波形(waveform) 與數值(value)。 舊式的壓力感受器與轉換器之間可分開使用或更換，現在大多將兩者合併製作，改為單一使用即棄式以減少感染的機會。,連續沖洗系統 整個監測系統使用前作管路排氣之用外，還可藉此維持管路的通暢。 臨床上最常使用含有少量肝素( 通常為1 U heparin/1 ml)的生理食鹽水，以避免血栓形成。 由於此導管通常使用在較高壓力的血管內，因此沖洗溶液外必需使用加壓袋(pressure bag) 加壓至300mmHg，可避免管路回血阻塞，另外還可藉此壓力使沖洗液以3 ml/hr的速度進入病人體內，以維持導管的通暢。 由於沖洗溶液中的肝素(heparin) 可能產生出血的副作用，因此臨床上多考量病人情況，以決定沖洗溶液中是否加入肝素。,監測的步驟與校正,維持適當的姿勢 平躺仰臥通常被認為是獲得正確血液動力數據的標準姿勢 當病人平躺會造成呼吸困難、疼痛、躁動時，讓病人採不同程度的半作臥姿勢反而才能的到較正確的數值，因此測量的姿勢應以病人舒適，不增加胸內壓的情況為準，不管採用何種姿勢，每次測量時應維持一致的姿勢，若姿勢改變時應在記錄上加以註明。,轉換器水平(leveling) 將壓力轉換器(transducer) 與正確的體外零點(external reference point) 放置在同一水平線上( 可使用水平儀確認是否水平)，其主要目的為 減少血液重量產生的靜水壓對壓力轉換器的影響。 當壓力轉換器低於體外零點的高度時，壓力轉換器會多承受此高度差異所產生的靜水壓力，而使所測得的壓力值比真正壓力值來的高 當壓力轉換器高於體外零點的高度時，所測得的壓力值會比真正壓力值來的低,歸 零(zeroing) 藉由轉動壓力轉換器上的三路活塞(3-way) 與大氣相通，使壓力轉換器視大氣壓力為相對性的零點，其主要目的是去除大氣壓力對壓力轉換器的影響。 實際操作的步驟為： 轉動壓力轉換器上的三路活塞使病人導管端關閉( 關病人) 使壓力轉換器與大氣端相通( 通大氣) 按下監測儀器上的歸零按鈕( 按Zero) 使壓力轉換器與大氣端關閉( 關大氣) 使壓力轉換器與病人導管端相通( 通病人)。,監測系統常見問題與處理方法,壓力的波形 波形高而尖(underdamped) 波形低而平緩(overdamped),監測系統常見的問題,常見之合併症與護理,感 染(infection) 導管插入時的無菌技術需嚴格執行 導管留置期間的導管護理需確實維持導管傷口清潔、乾燥，導管護理的常規因各醫院有所不同( 一般來說，導管傷口應每天換藥 連續沖洗系統溶液或輸液應每天更換 監測系統導管應每3 天更換一次、插入導管每7 天更換一次等)。,出 血(hemorrhage) 滲血(oozing)，可以紗布直接加壓止血，尤其是動脈導管因為壓力高，因此拔管後傷口應直接加壓510 分鐘以上，以避免出血或血腫。 導管的接頭需確實連接妥當，避免因接頭鬆脫(disconnection)而造成大出血。 對於躁動的病人，應予適當的保護性約束或鎮靜藥物，以避免自拔導管造成大出血。,栓 塞(embolism) 連續沖洗系統溶液內含少量肝素，並且在溶液外維持加壓袋300mmHg 的壓力，均可預防血栓的形成 導管內的空氣或血塊可能產生血管內栓塞，因此監測系統內若有空氣或血塊，應以回抽的方式抽出，不可以管路沖洗的方式將空氣或血塊沖入體內。 血栓與導管的留置( 尤其是動脈導管) 均可能影響該血管的血液灌流，因此需特別注意末梢的血循狀況，並且比較雙側肢體的膚色、溫度、脈搏強度、有無疼痛或麻痺等感覺異常的情形。,常用的監測導管,中心靜脈導管(central venous catheter) 動脈導管(artery catheter) 肺動脈導管(pulmonary artery catheter 或稱Swan-Ganz catheter),中心靜脈導管 (central venous catheter),插入部位與優缺點 臨床應用 測壓方法 判 讀,插入部位與優缺點,臨床應用,作為輸液的管路 可用來作輸液管路，可方便於給予大量或特殊輸液( 例如TPN)，以及特殊藥物( 例如化學藥物、dopamine)。 測量中心靜脈壓 中心靜脈導管若連接測壓計(水柱式或血液動力監測系統) 可測量到該處的中心靜脈壓力(central venous pressure; CVP)CVP值可作為反應病人血液動力狀態之用 有意義的CVP 值是指右心房(right atrium; RA) 或靠近右心房的腔靜脈(vena cava) 壓力值，因此由鎖骨下靜脈或內頸靜脈插入至右心房處，方能測得到較準確的CVP 值時,測壓方法,Guide to interpretation of the CVP in the hypotensive patient,CVP reading：Low Rapid pulse Blood pressure normal or low Low urine output Poor capillary refill Diagnosis to consider:Hypovolaemia Treatment:Give fluid challenges* until CVP rises and does not fall back again. If CVP rises and stays up but urine output or blood pressure does not improve consider inotropes,CVP reading：Low Rapid pulse Signs of infection Pyrexia Vasodilation Diagnosis to consider:Sepsis Treatment:Ensure adequate circulating volume (as above) and consider inotropes or vasoconstrictors,CVP reading：Normal Rapid pulse Low urine output Poor capillary refill Diagnosis to consider:Hypovolaemia Treatment:Treat as above. Venoconstriction may cause CVP to be normal. Give fluid challenges* and observe effect as above.,CVP reading：High Unilateral breath sounds Assymetrical chest movement Resonant chest with tracheal deviation Rapid pulse Diagnosis to consider:Tension pneumothorax Treatment:Thoracocentesis then intercostal drain,CVP reading：High Breathlessness Third heart sound Pink frothy sputum Oedema Tender liver Diagnosis to consider:Heart failure Treatment:Oxygen, diuretics, sit up, consider inotropes,CVP reading：Very High Rapid pulse Muffled heart sounds Diagnosis to consider:Pericardial tamponade Treatment:Pericardiocentesis and drainage,影響CVP 值的因素,Fluid challenge,In hypotension associated (伴隨)with a CVP in the normal range give repeated boluses(大量 )of intravenous fluid (250 - 500mls). Observe the effect on CVP, blood pressure, pulse, urine output and capillary refill(再充填). Repeat the challenges(補充液體) until the CVP shows a sustained rise and/or the other cardiovascular parameters return towards normal. With severe blood loss, blood transfusion will be required after colloid or crystalloid have been used in initial resuscitation. Saline or Ringers lactate should be used for diarrhoea/bowel bstruction /vomiting /burns etc.,動脈導管(artery catheter),導管的插入與部位 臨床應用,Minimum Competency(Nurse),Must be able to identify the indications(適應症) for arterial pressure monitoring. The nurse must payable to assemble necessary equipment(設備) for insertion of an arterial catheter. The nurse must be able to perform a Allens test. Support the patients wrist and dorsiflex the radius to assist the physician during insertion. Level the transducer with the phlebostatic axis. This must be repeated at least every four hours and as needed.(零點水平),The nurse will be unable to identify the normal arterial waveform and troubleshoot(檢修故障) any deviations as needed. During flushing(沖洗管路), the nurse will observe the skin at the site and distally(遠端) for blanching. Compared(比較) to direct arterial pressure measurements with the indirect measurements. The pulse, color, sensation, and temperature, distal to the site will be assessed(評估) every two to four hours. The nurse caring for a patient with arterial line must be able to change the flush solution, tubing and dressing, according to hospital guidelines. Inspect(監測) for signs of infection.,The nurse caring for a patient with an arterial line must be able to obtain(獲得) blood samples(血液檢體) from the arterial catheter using the needless system. After the arterial catheter is removed pressure(加壓) will be held directly over the site for 10 minutes. The nurse with document(文件) all pertinent(相關的) information on the flow sheet and clinical record.,Indications for arterial blood pressure measurements,When accuracy(準確) in blood pressure measurement is needed Frequency(持續)of blood pressure is needed,Some of those are as follows,Gradual (漸進的 )or acute hypotension or hemorrhage. Circulatory or cardiac arrest(暫停). Hypertensive crisis(危象). Sepsis are respiratory failure. Neurologic injury. Post-operative complications. When the patient is on vasoactivedrugs (血管作用藥物) such as dopamine, nitroglycerin, The arterial line may also be used when the patient requires frequent ABGs or other blood work.,Limitations of arterial lines,The arterial line pressures should be 5 to 20 mmHg higher(較高) then cuffed measurements. If the arterial line pressure 5-20 mmHg over cuff pressure measurement, one of the following is occurring: cuff is too small for the pt arm, will read high. cuff is too large for the p/t arm, will read to low. Equipment malfunction(發生故障 ). in severe shock, or hypothermia, occlusive peripheral vascular disease.,Potential(潛在的 )complications.,Hemorrhage. Air emboli. Equipment malfunction. Inaccurate pressures. Dysarhythmias. Infections Tubing separation. Altered skin integrity. Impared circulation to extremities. Altered hemodynamics.,導管的插入與部位,EQUIPMENT,500 mls Heparinize Normal Saline ( premixed) Pressure Bag 2 x 5 ml. syringes Surgical mask Sterile gloves Insite cannula 20 G x 2Monitoring cable and module Disposable pressure monitoring kit OP site Sterile Normal Saline flush x 2,臨床應用,抽血檢查 測量血壓 不可使用沖洗溶液以外的靜脈輸液，以避免動脈組織的壞死或硬化。,抽動脈血,一般血液 生化檢查 動脈血液氣體分析 不可用來作血液培養(blood culture)。,監測血壓,校正 第四肋間與腋中線交叉點 導管插入部位為體外零點,正常動脈波型,各部位動脈導管壓力波型,肺動脈導管 (pulmonary artery catheter or Swan-Ganz catheter),導管簡介 插管部位與步驟 臨床應用 /med/topic2956.htm#target1,Introduction,The flow-directed(流量指引) balloon-tipped pulmonary artery (PA) catheter The Swan-Ganz catheter SGC) has been in clinical use for almost 30 years. Initially developed for the management of acute myocardial infarction (AMI), Now has widespread(普及的 ) use in the management of a variety of critical illnesses and surgical procedures.,History,In 1929, Werner Forssmann was to develop a technique for direct delivery(傳送 ) of drugs to the heart. H.J.C. Swan noticed a sailboat moving quickly despite the calm weather. This led to the initial idea of devising a catheter with a parachutelike(類似延緩落體的裝置) or sail-like device attached. William Ganz on the thermodilution(溫度稀釋) method of measuring cardiac output (CO) was incorporated(結合) into the catheters use. This basic design remains in use today.,The heart and pulmonary system,INDICATIONS-1,評估左心功能 反應強心劑在降低Preload & Afterload之效果 監測混合靜脈血氧飽和濃度(SvO2) Therapeutic - Aspiration of air emboli,INDICATIONS-2,Diagnostic Diagnosis of shock states (休克狀態) Differentiation(區別) of high- versus low-pressure pulmonary edema Diagnosis of primary(原發性) pulmonary hypertension肺高壓 (PPH) Diagnosis of valvular disease, intracardiac shunts(分流), cardiac tamponade, and pulmonary embolus (PE) Monitoring and management of complicated AMI Assessing (評估) hemodynamic response to therapies Management of multiorgan(多重器官) system failure and/or severe burns Management of hemodynamic instability(不穩定 ) after cardiac surgery Assessment of response to treatment in patients with PPH,Contraindications (禁忌症 ),Tricuspid or pulmonary valve mechanical prosthesis(置換 ) Right heart mass (thrombus and/or tumor) Tricuspid or pulmonary valve endocarditis,導管簡介,110 cm long, with extra connecting tubes for attachment to the pressure transducer PA lumen or distal(遠端) lumen:開口在尖端 RA lumen or proximal(近端) lumen:開口在距導管尖端30公分處,測量RAP,相當於CVP Thermistor(溫度偵測) lumen:距導管尖端4公分處有對溫度敏感的金屬絲, is the used to measure temperature changes for calculation of CO. (以溫度稀釋法) Balloon lumen:距導管尖端1公分處,Four lumen,Five lumen-CCO,Six lumen-CCO,SvO2,插管部位與步驟,Zero reference歸零 The reference point for this is the midpoint of the left atrium (LA), estimated as the fourth intercostal space(第四助間) in the midaxillary line (腋中腺)with the patient in the supine position(平躺). Calibration (校正) Dynamic動態的 tuning,Insertion,Preference(選擇) considerations for cannulation of the great veins are as follows: Right internal jugular vein (RIJ) 右內頸靜脈- Shortest and straightest path to the heart Left subclavian右鎖骨下靜脈- Does not require the SGC to pass and course at an acute angle to enter the SVC (compared to the right subclavian or left internal jugular LIJ) Femoral veins 股靜脈- These access points are distant sites, from which passing a SGC into the heart can be difficult, especially if the right-sided cardiac chambers are enlarged.,導管插入護理措施,Trendelenburg position is used for venous access(取得) Before insertion, check the SGC for cracks(破裂 ) and kinks. Check balloon function, connect all lumens to stopcocks, and flush them to eliminate air bubbles. /Products/PACatheters/placementvideo.htm After inserting the SGC as far as the 20-cm mark (30-cm mark if the femoral route used), the balloon is inflated with air. Inflation should be slow and controlled (1 cc/s) and should not surpass the recommended volume (usually 1.5 cc).,Always use continuous pressure monitoring from the distal lumen. Watch the monitor for changes in the waveform and abnormal cardiac rhythms. The RA is entered at approximately 25 cm, The RV at approximately 30 cm, The PA at approximately 40 cm; The PCWP can be identified at approximately 45 cm. If an RV waveform still present approximately 20 cm after the initial RV pattern appears, the catheter may be coiling in the RV. fluoroscopy may be necessary to visualize the catheter and remove the knot.,PADPAWP LEVEDP LAP 相差15mmHg 當肺血管,僧帽瓣及左心室功能正常時PAWP- 間接代表左心的壓力,也相當於LV之Preload 評價左心的功能及預後的重要指標 決定藥物治療的重要因素,PAD LAP,正常相差15mmHg 肺高壓或肺栓塞相差會大於5mmHg 當病人出現下列情況:PAWPLVEDP時無法反映左心功能 胸內壓明顯上升 肺靜脈阻塞 僧帽瓣狹窄 左心房黏液瘤,For pulmonary capillary wedge pressure (PCWP) to be reliable, the catheter tip must lie in zone 3(左心房下之肺區,教能正確反應LAP.Pulmonary artery pressure (Ppa) is greater than pulmonary venous pressure (Ppv), which is greater than alveolar pressure (Palv)